package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
@WebFilter(filterName="EncodeFilter",urlPatterns="/*",initParams={@WebInitParam(name="encode",value="UTF-8"),@WebInitParam(name="contentType",value="text/html;charset=UTF-8")})
public class EncodeFilter implements Filter {
   private String encode=null;
   private String contentType=null;

	@Override
	public void destroy() {
		encode=null;
		contentType=null;	
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if(null==request.getCharacterEncoding()){
			request.setCharacterEncoding(encode);
		}
		if(null==response.getContentType()){
			response.setContentType(contentType);
		}
		chain.doFilter(request,response);
	}
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		String encode=filterConfig.getInitParameter("encode");
		String contentType=filterConfig.getInitParameter("contentType");

		if(this.encode==null){
			this.encode=encode;
		}
		if(this.contentType==null){
			this.contentType=contentType;
		}
		
	}

}
